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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a62209cd7f34dd35c5548f99ae464d51f42f3046ebdb4d56e1a0a74773ce625' 
  AND token = 'ZhoMvi2YZf4SjCK9vrxj7XnOLxmSaPg1uoxTD31G770=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}